Section 1
In the descriptions of the following authorisations, a reference to the supply system of a water undertaker is a reference to the supply system of a water undertaker whose area is wholly or mainly in England— a retail authorisation; a wholesale authorisation. In the descriptions of the following authorisations, a reference to the supply system of a water undertaker is a reference to the supply system of a water undertaker whose area is wholly or mainly in Wales— a restricted retail authorisation; a supplementary authorisation. A retail authorisation given by a water supply licence is an authorisation to the water supply licensee to use the supply system of a water undertaker for the purpose of supplying water to the premises of— the licensee, persons associated with the licensee, or the licensee's customers. None of the premises supplied by a water supply licensee under a retail authorisation may be household premises (as defined in section 17C). A wholesale authorisation given by a water supply licence is an authorisation to the water supply licensee to introduce water into the supply system of a water undertaker— by means of which system any particular supply in accordance with a retail authorisation (whether the licensee's or another water supply licensee's) is to take place, and where that introduction is to be made in connection with that intended supply. A restricted retail authorisation given by a water supply licence is an authorisation to the water supply licensee to use the supply system of a water undertaker for the purpose of supplying water to the premises of the licensee's customers. The following requirements must be satisfied in relation to each of the premises to be supplied by a water supply licensee under a restricted retail authorisation— the requirement that the premises are not household premises (as defined in section 17C); the threshold requirement (construed in accordance with section 17D). A supplementary authorisation given by a water supply licence is an authorisation to the water supply licensee to introduce water into the supply system of a water undertaker— by means of which system any particular supply in accordance with the licensee's restricted retail authorisation is to take place, and where that introduction is to be made in connection with that intended supply. The requirements in paragraphs 4 and 7 are enforceable by the Authority under section 18. The Authority may from time to time, with the approval of the Secretary of State, issue guidance as to the factors that are, or are not, to be taken into account in determining the extent of any premises for the purposes of paragraphs 4 and 7. Before giving approval under sub-paragraph (1) the Secretary of State must consult the Welsh Ministers. For the purposes of this Schedule, a person (A) is associated with a water supply licensee (L) if— where A and L are bodies corporate, one of them is a subsidiary of the other or both are subsidiaries of the same body corporate; where A or L is an individual or an unincorporated association and the other is a body corporate, that individual or unincorporated association controls the other or a body corporate of which the other is a subsidiary; A is a partnership of which L is a member. In paragraph 11 “